1 hchem

• Metallic elements

  Lithium, beryllium, sodium, magnesium, aluminium, potassium, calcium
• Monotomic


  helium, neon, argon (noble gases)
• Covalent molecular 


  Hydrogen, nitrogen, oxygen, chlorine, phosphorus, sulphur
• Covalent networks

  Boron, carbon, silicon
• Carbon 


  Diamond - non conductor

  graphite - conductor
• Low electronegativity 


  Strong reducing agents
• High electronegativity 


  Strong oxidising agents